International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
www.irjet.net
Effect of Staircase Design Variation on Structural Performance Under Seismic Forces Harshad Hirani1, Prof. Aakash Suthar2 1M.E. Student, L J University
2Professor, Dept. of Civil Engineering, L J University, Gujarat, India
---------------------------------------------------------------------***--------------------------------------------------------------------1.1 Response Spectrum Method Abstract - Nonetheless, the staircase is often overlooked in design, which could influence the seismic performance of buildings. In this study, various kinds of staircases have been examined. I have examined three types of staircases. This study has investigated the effects of an earthquake on different kinds of staircases. The staircase is generally not regarded as a main structural element in building design and is viewed merely as a secondary structural element. A key element of the structure is the staircase. Consequently, if not considered during analysis and design, the structure is at risk of suffering damage. In this section, we analyze the staircase models for different styles of staircases to observe how seismic impacts on buildings vary with the addition of more staircases to an existing framework. To analyze using the response spectrum method. The analysis is performed using ETABS software. The linear response spectrum analysis of the models was carried out using the ETAB 21 software, following IS: 1893 (Part-1) - 2016 and IS: 456 - 2000 standards.
The response spectrum method is a well-known structural engineering approach for evaluating the seismic reaction of buildings and various structures, offering an estimate of the structure's response to ground motion by accounting for the system's dynamic characteristics. The response spectrum displays the highest response of a dynamic system across various vibration frequencies. A target design spectrum, often derived from building regulations or specific design standards, is then aligned with the response spectrum of the ground motion. The design spectrum outlines the anticipated reaction of the structure to ground motion at different frequencies. The dynamic behavior of the structure is represented as a set of idealized mass, stiffness, and damping components. A modal analysis is conducted to determine the natural frequencies, mode shapes, and modal masses of the structure. Mode Superposition: By applying the superposition principle, the responses for each mode are initially determined separately and subsequently merged. Taking into account the modal mass and participation factor of each mode, the contribution of the overall response from each mode is assigned a weight.
Key Words : Story Displacement, Story Drifts, Response spectrum analysis, Half turn staircase, Open-well staircase analysis with ETABS
1.INTRODUCTION
1.2 Objectives
An earthquake acts quite differently since it is an unplanned occurrence. Unlike other load types such as gravity and wind loads, the force generated by an earthquake is distinct. The most vulnerable part of the three-dimensional structure is hit. The building has numerous flaws due to inadequate design and construction, which can greatly endanger individuals and their belongings. Due to its functional importance, the staircase serves as a vital part of secondary structural systems and is one of the essential elements of a building. The staircase features distinct designs for non-seismic and seismic conditions due to the complex modeling of the structure. From a geometric viewpoint, a stair consists of an inclined component (beams and slabs) and a brief column. These elements contribute to the rigidity of the structure. This indicates that the influence of a staircase must not be overlooked when evaluating and designing RC frame structures.
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Impact Factor value: 8.315
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The main objective of this study is to check the kind of performance a building can give when designed as per Indian Standard Codes.
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To investigate how various staircase types affect a structure that is subject to seismic forces.
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To study the shear wall at different location subjected to seismic force.
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To investigate the structural members close to the staircase’s seismic response to seismic loads.
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